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/*
* file_loader.c - Implementation of some file loading functionality.
*/
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "file_loader.h"
/*
* Read an entire file into memory.
*/
file_t *load_file(const char *filename)
{
if (filename == NULL) filename = "-";
int fd = strcmp(filename, "-") != 0 ? open(filename, O_RDONLY) : STDIN_FILENO;
if (fd < 0) return NULL;
file_t *f = calloc(sizeof(file_t), 1);
f->filename = strdup(filename);
// TODO: use mmap when possible
struct stat sb;
if (fstat(fd, &sb) == -1)
goto skip_mmap;
f->contents = mmap(NULL, (size_t)sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (f->contents == MAP_FAILED)
goto skip_mmap;
f->mmapped = 1;
f->length = (size_t)sb.st_size;
goto finished_loading;
skip_mmap:
f->mmapped = 0;
size_t capacity = 1000;
f->length = 0;
f->contents = calloc(sizeof(char), capacity);
ssize_t just_read;
while ((just_read=read(fd, &f->contents[f->length], capacity - f->length)) > 0) {
f->length += (size_t)just_read;
if (f->length >= capacity)
f->contents = realloc(f->contents, sizeof(char)*(capacity *= 2) + 1);
}
close(fd);
finished_loading:
f->end = &f->contents[f->length];
// Calculate line numbers:
size_t linecap = 10;
f->lines = calloc(sizeof(const char*), linecap);
f->nlines = 0;
char *p = f->contents;
for (size_t n = 0; p && *p; ++n) {
++f->nlines;
if (n >= linecap)
f->lines = realloc(f->lines, sizeof(const char*)*(linecap *= 2));
f->lines[n] = p;
p = strchr(p, '\n');
if (p) ++p;
}
return f;
}
void destroy_file(file_t **f)
{
if ((*f)->filename) {
free((char*)(*f)->filename);
(*f)->filename = NULL;
}
if ((*f)->lines) {
free((*f)->lines);
(*f)->lines = NULL;
}
if ((*f)->contents) {
if ((*f)->mmapped) {
munmap((*f)->contents, (*f)->length);
} else {
free((*f)->contents);
}
(*f)->contents = NULL;
}
free(*f);
*f = NULL;
}
size_t get_line_number(file_t *f, const char *p)
{
// TODO: binary search
for (size_t n = 1; n < f->nlines; n++) {
if (f->lines[n] > p)
return n;
}
return f->nlines;
}
size_t get_char_number(file_t *f, const char *p)
{
size_t linenum = get_line_number(f, p);
return 1 + (size_t)(p - f->lines[linenum-1]);
}
const char *get_line(file_t *f, size_t line_number)
{
if (line_number == 0 || line_number > f->nlines) return NULL;
return f->lines[line_number - 1];
}
void fprint_line(FILE *dest, file_t *f, const char *start, const char *end, const char *msg)
{
size_t linenum = get_line_number(f, start);
const char *line = get_line(f, linenum);
size_t charnum = get_char_number(f, start);
fprintf(dest, "\033[1m%s:%ld:\033[0m %s\n", f->filename, linenum, msg);
const char *eol = linenum == f->nlines ? strchr(line, '\0') : strchr(line, '\n');
if (end == NULL || end > eol) end = eol;
fprintf(dest, "\033[2m% 5ld |\033[0m %.*s\033[41;30m%.*s\033[0m%.*s\n",
linenum,
(int)charnum - 1, line,
(int)(end - &line[charnum-1]), &line[charnum-1],
(int)(eol - end), end);
fprintf(dest, " \033[34;1m");
const char *p = line - 1;
for (; p < start; ++p) fputc(' ', dest);
if (start == end) ++end;
for (; p < end; ++p) fputc('^', dest);
fprintf(dest, "\033[0m\n");
}
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